Search Publications
FOXSI-2 Solar Microflares. II. Hard X-ray Imaging Spectroscopy and Flare Energetics
Krucker, Säm; Ryan, Daniel F.; Musset, Sophie +7 more
We study the nature of energy release and transfer for two sub-A class solar microflares observed during the second Focusing Optics X-ray Solar Imager (FOXSI-2) sounding rocket flight on 2014 December 11. FOXSI is the first solar-dedicated instrument to utilize focusing optics to image the Sun in the hard X-ray (HXR) regime, sensitive to energies …
Mass-radius relation of intermediate-age disc super star clusters of M82
Mayya, Y. D.; Rosa-González, D.; Puerari, I. +1 more
We present a complete set of structural parameters for a sample of 99 intermediate-age super star cluster (SSCs) in the disc of M82, and carry out a survival analysis using the semi-analytical cluster evolution code EMACSS. The parameters are based on the profile-fitting analysis carried out in previous work, with the mass-related quantities deriv…
Magneto-acoustic oscillations observed in a solar plage region
Cao, Wenda; Xu, Zhe; Ji, Kaifan +4 more
We gave an extensive study for the quasi-periodic perturbations on the time profiles of the line of sight (LOS) magnetic field in 10 × 10 sub-areas in a solar plage region (corresponds to a facula on the photosphere). The perturbations are found to be associated with the enhancement of He I 10830 Å absorption in a moss region, which is connected t…
Implications of Increased Central Mass Surface Densities for the Quenching of Low-mass Galaxies
Papovich, Casey; Pérez-González, Pablo G.; Bell, Eric F. +12 more
We use the Cosmic Assembly Deep Near-infrared Extragalactic Legacy Survey data to study the relationship between quenching and the stellar mass surface density within the central radius of 1 kpc (Σ1) of low-mass galaxies (stellar mass M* ≲ 109.5 M⊙) at 0.5 ≤ z < 1.5. Our sample is mass complete down t…
Global Hybrid Simulations of Interaction Between Interplanetary Rotational Discontinuity and Bow Shock/Magnetosphere: Can Ion Scale Magnetic Reconnection be Driven by Rotational Discontinuity Downstream of Quasi Parallel Shock?
Wang, Xueyi; Lin, Yu; Guo, Zhifang
Ion scale magnetic reconnection has been observed downstream of the terrestrial quasi parallel (Q ∥) shock. Whether it is driven by interplanetary discontinuities or turbulent Q ∥ shock, however, is unclear. Using three dimensional global hybrid simulation, we investigate the generation of magnetic reconnection downstream of the Q ∥ shock, while a…
The Characterization of the Dust Content in the Ring Around Sz 91: Indications of Planetesimal Formation?
Palau, Aina; Carrasco-González, Carlos; Olofsson, Johan +6 more
One of the most important questions in the field of planet formation is how millimeter- and centimeter-sized dust particles overcome radial drift and fragmentation barriers to form kilometer-sized planetesimals. ALMA observations of protoplanetary disks, in particular transition disks or disks with clear signs of substructures, can provide new con…
A Preliminary Calibration of the JAGB Method Using Gaia EDR3
Madore, Barry F.; Freedman, Wendy L.; Lee, Abigail J. +2 more
The recently developed J-region asymptotic giant branch (JAGB) method has extraordinary potential as an extragalactic standard candle, capable of calibrating the absolute magnitudes of locally accessible Type Ia supernovae, thereby leading to an independent determination of the Hubble constant. Using Gaia Early Data Release 3 (EDR3) parallaxes, we…
Widespread occurrence of high-velocity upflows in solar active regions
Baker, D.; Brooks, D. H.; Yardley, S. L.
Aims: We performed a systematic study of 12 active regions (ARs) with a broad range of areas, magnetic fluxes, and associated solar activity in order to determine whether there are upflows present at the AR boundaries and, if these upflows exist, whether there is a high-speed asymmetric blue wing component present in them.
Methods: To id…
Gas Infalling Motions in the Envelopes of Very Low Luminosity Objects
Kim, Gwanjeong; Kim, Mi-Ryang; Lee, Chang Won +2 more
We present the results of a single-dish survey toward 95 very low luminosity objects (VeLLOs) in optically thick (HCN 1-0) and thin (N2H+ 1-0) lines performed for the purpose of understanding the physical processes of inward motions in the envelopes of the VeLLOs and characterizing their true nature. The normalized velocity d…
Towards a more rigorous treatment of uncertainties on the velocity distribution of dark matter particles for capture in stars
Lopes, Ilídio; Lacroix, Thomas; Lopes, José
Dark matter (DM) capture in stars offers a rich phenomenology that makes it possible to probe a wide variety of particle DM scenarios in diverse astrophysical environments. In spite of decades of improvements to refine predictions of capture-related observables and better quantify astrophysical and particle-physics uncertainties, the actual impact…